Usage
I2L is relatively simple to construct on an integrated circuit, and was commonly used before the advent of CMOS logic by companies such as Motorola (now Freescale) and Texas Instruments. In 1975, Sinclair Radionics introduced one of the first consumer-grade digital watches, the Black Watch, which used I2L technology.
Generally, I2L gates were constructed with transistors with 1, 2 or 3 separate collectors. This fan-out of up to 3 allowed 3-input NAND or NOR gates to be constructed very simply.
Read more about this topic: Integrated Injection Logic
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